Microtektites in Deep-Sea Sediments of the Southern Tasman Sea : the Environmental Effect Recorded in the Extraterrestrial Impact Event
详细信息
- 责任者：Li Wenbao (Water Conservancy and Civil Engineering Collage ; Inner Mongolia Agricultural University ; Hohot010018 ; China) ; Wang Rujian
- 刊名：Quaternary Sciences
- 出版年：2011
- 卷期：31(5)
- 关键词：微玻陨石 ; microtektites ; 环境效应 ; environmental effect ; 太平洋 ; Pacific Ocean
- 页码：p.849-855
- 图表：4 illus., 2 tables, 31 refs.
- 分类号：0100
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
In this paper,the influences of the impact event on marine and land vegetations through the analyses of microtektite abundance, different biomarkers, foraminiferal δ 18 O and δ 13 C, and Sea Surface Temperature (SST) records from the interval of 16~15 m (mbsf) in depth at ODP Site 1170 B (47°9.0344’S, 146°2.9846’W; water depth of 2 705 m) of the Southern Tasman Sea are studied. The results show that: 1) the peak of microtektites abundance occurs at the depth of 15.55~15.45 m, and these microtektites were caused by the Australian Meteorite Impact Event (AMIE); 2) the AMIE resulted in the decrease of SST by about 1.7 ℃, and decrease of the ratio of coccolith/diatom from about 6.0 to about 2.6 from the depth of 15.58 m to 15.50 m, and decrease of the content of C15~19 and C21~25 by around 50 ％; and 3) the influences of AMIE on the terrestrial vegetation structure and terrestrial organic matter input could be limited.
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